Mid infrared polarization engineering via sub-wavelength biaxial\n hyperbolic van der Waals crystals

2020/07/22 by Saurabh Kumar Dixit, Nihar Ranjan Sahoo, Dixit, Saurabh +5
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Photonic and Optical Devices #Photonic Crystals and Applications

paper · pdf · doi:10.48550/arxiv.2007.11265

Abstract

Recently, in-plane biaxial hyperbolicity has been observed in\n\α-MoO₃ --a van der Waal crystal-- in the mid-infrared frequency\nregime. Here, we present a comprehensive theoretical analysis of thin film\n\α-MoO₃ for application to two mid-IR photonic devices -- a\npolarizer and a waveplate. We show the possibility of a significant reduction\nin the device footprint while maintaining an enormous extinction ratio from\n\α-MoO₃ based polarizers in comparison with that of conventional\npolarizers. Secondly, we carry out device optimization of \α-MoO₃\nbased waveplates with subwavelength thickness. We explain our results using\nnatural in-plane hyperbolicity of \α-MoO₃ via analytical and full\nwave simulations. This work will build a foundation for miniaturization of\nmid-infrared photonic devices by exploiting the optical anisotropy of\n\α-MoO₃.\n

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